Process of making magnesium cement.



specification.

UNITED OFFICE.

WILLIAM SIE GMANN, OF BALTIMORE, MARYLAND, ASSIGNOR TO.MARY V. GAUL'I,

.0 F BALTIMORE, MARYLAND.

PROCESS OF MAKING MAGNESIUM CEMENT.

No Drawing.

To all whomiz. may concern:

Be-it known that I, VVIL'LInM SIEGMANN, a subject of the Emperor of Germany, residing at Baltimorecity, State of Maryland, have invented new anduseful Improvements in Processes of Making Magnesium Cement, of which the following is a This invention relates to. an improved composition of matter.

The invention has for its ob ect the production of a composition which is'fire proof,

water proof, acid proof, and also a non-conductor of electricity.

A further object is to produce a composition of matter which may be molded or otherwise shaped to formvarious articles of manufacture.

A further object isto form a composition of matter in powdered form which may be used in combination with moisture to form a plastic material for building-or other purposes. a I

The invention will be hereinafter fully set forth and particularly pointed-out in the claims.

In carrying out my invention I form a dry, substantially non-hygroscopic powder composed of a mixture of magnesium oxid, or equivalent oxid, sulfate of magnesia, common salt or sodium chlorid and kieselguhr. The composition thus obtained is ready'for use by merely adding sufficient water and "carbon bisulfid to produce a plastic composition which can be molded into any desired shape or which may be applied in its plastic state to walls or other parts of a I no building. -In order to render the salt nonhygroscopic the water of crystallization is first removed after which the saltis powdered. It is well known that oXicl of magnesium and the sulfate of magnesium" will not combine in the absenee'of some ingredient which will combine with them to form a chlorid. The efi'ect'of the salt upon the owdered mixture when moistened by water 15 to accomplish this result by causing the oxid to combine with the magnesium oxid to form magnesium chlorid which in turn combines with the magnesium sulfate, thus forming a plastic mixture which will harden into a homogeneous mass. The carbon bisulfid increases the set and consequently the hardness of the composition. Experiment has'demonstrated that if the composition is Specification of Letters Patent. Application filed April 7, 1911. Serial No. 619,514.

Patented July 7, 1914..

mixed with water alone considerable time 15 required for setting. The carbon bisulfid {when added to the mixture, will rapidly evaporate and consequently increase the setting. It will also partly reduce some of the chlorid owing to the combination of the latter with the silica 'l the kieselguhr. The kieselguhr has well known neutral properties and serves as a filler, and experiments and tests have demonstrated that because of the very high percentage of.

silica contained in the kicselgnhr the prodnot produced is fireproof, water proof, acid I proof, and also a non-conductor of electricity. It will be noted in this connection that while I have specified the oxid of magnesium I do not limit myself thereto as the oxid of zinc, oxid of calcium, oxid of alumina, and other equivalent oxids may be substituted for the oxid of magnesium without departing from the spirit of my invention. It will also be notedthat various other sulfates may be substituted for the sulfate of magnesia without departing from my invention, as the latter contemplates any admixture in which the gradual production of oxy-chlorid of magnesium is accomplished.

i If it is desired to modify the set by retarding the formation of the chlorid, calcined gypsum, boric acid, powdered borax, or other equivalent ingredient may be added. If it is desired to vary the hardness of the compositoin to secure pliability, asbestos, inany suitable form may becombined with the 'kieselguhr as a filler. I have also found that colophonium used as a filler in combination with the kieselguhr, either with or without the asbestos forms a material that may be readily cut and shaped for various uses. It is also obvious that coloring matter may also be introduced or not as de sired.

A suitable composition made in accordance withmy invention may be produced by m x g,

Magnesium sulfate 2 lbs.

. Magnesium oxid 4.- lbs. Sodium chlorid J lb. Kieselguhr 10 lbs. Asbestos 2 lbs. Colophoni'uin 1 lb.

Water and carbon bisulfid in equal proportions are added in suilicient quantities to form a plastic compound. It will be understood however, that I do not desire to limit myself to the foregoing proportions as the same may be varied according to the character of the material to be produced.

ders the composition, highlyjineutral and produced many qualities that are highly dc sirable in the. usefularts.i=

I claim as my invention:-

1. The herein described. process for producing a composition consisting of mixing water, magnesium oxid, sodium chlorid, kieselguhr, asbestos and colophonium to produce a plastic compound and adding carbon bi-sulfid to increase evaporation of 5 The colophonium is preferably introduced in a ground or powdered state. It can be introduced, however, in a liquid state, in which event the sam is dissolved in carbon bisulfid.

From the foregoing it will be seen that my improved composition of matter maybemade moisture and thedissolution of other inup in the form of a powder which maybe gredients. shipped and handled as such and afterward The herein described process for prov ducing a composition of matter consisting in mixed with water or carbon-bisulfid, or both comminghng magnesium oxid, magnesium '15 to form a plastic material which is adapted for building material, pavements, and all inside and outside work. lVhen the said powder is mixed with carbon-bisulfid alone the latter will act as a quick and excellent clissolver 30 for sodium chlorid, and magnesium sulfate as well as colophonium. -Or these ingredients may be combined and molded into any desired shape for such use as may be found v convenient. It is also obvious that the same 25 will form a very hard substance, or the de gree of hardness, elasticity and rigidity thereof may be varied by altering the proportions. of the ingredients to produce material'suitable to be operated upon by edge 30 tools The addition of the kieselguhr rensulfa'te, common salt, kieselguhr, and adding water and carbon-bisulfid thereto.

3. The herein described process for producing a composition of matter consisting in mixing oxid of magnesium, sulfate of magnesium, asbestos, colophonium, kieselguhr and common salt and in mixing the same with water and carbon bi-sulfid.

In testimony whereof I have hereunto set my hand in presence of two srbscriblng wit- 

